Impedance and modulus spectroscopy of thermally synthesised ZnFe2O4 prepared through the mediation of different polymers

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Bulletin of Materials Science Pub Date : 2025-01-24 DOI:10.1007/s12034-024-03374-2

Harsha Chouhan, Sushil Kumar Behera, Maheswar Panda

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引用次数: 0

Abstract

ZnFe₂O₄ was thermally synthesised through the mediation of different polymers such as Poly(vinyl alcohol), Poly(vinyl pyrrolidone) and Poly(ethylene glycol) to prevent the unwanted agglomeration. The Rietveld refinement of the XRD spectra confirmed the sample to be fcc, while the FESEM/TEM micrographs exhibited the formation of spherical nanoparticles. The TGA/DSC analysis confirmed that the sample is stable up to 500°C. The dielectric, impedance and modulus spectroscopy as a function of temperature up to 200°C and within the frequency range of 20 Hz to 2 MHz confirm a single non-Debye type relaxation behaviour at different temperatures (well fitted by the KWW (Kohlrausch–Williams–Watts) function) attributed to the grain boundary/MWS polarisation present in the samples. The modulus and impedance master curve confirmed the distribution of relaxation times being independent of temperature. The AC conductivity phenomenon is explained using the CBH (correlated barrier hopping) model, satisfying Jonscher's universal power law with exponents in the range of [0,1] with an activation energy in the range of 0.4–0.8 eV. The obtained optical spectra of the samples with the help of UV-visible/PL spectra evaluate the direct energy band gap to be from 1.7 eV to 2.8 eV and these ferrites may be suitable for high-frequency as well as for optoelectronic applications.

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来源期刊

Bulletin of Materials Science 工程技术-材料科学：综合

CiteScore

3.40

自引率

5.60%

发文量

209

审稿时长

11.5 months

期刊介绍： The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.